In years past, the "Residence and Retreat" lines were considered not mobile. Keystone's owner's manual warranty has an exclusion for those lines giving the impression that dealerships are authorized to make "on site repairs" for those two lines. Read your owner's manual, specifically page 5. You should find this exclusion:
"Service Calls (except for Travel Trailers with a detachable A-Frame)
or repairs completed by Non-Authorized dealers are not warranted by
Keystone. Should you encounter a situation that may require such a
service, contact your selling dealer for assistance PRIOR to incurring
these types of expense."
If your trailer is "new and has the Keystone warranty in effect" then that exclusion should get you dealership support to your site. If it's a used unit without warranty, then you'll be on your own and might get help from the dealer, but Keystone would be out of the loop as the warranty expired one year from date of original sale.
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS